<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta http-equiv="X-UA-Compatible" content="ie=edge">
  <title>javascript</title>
  <style>
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box
    }
    body {
      font-size: 14px;
      padding: 20px;
    }
    ul li {
      line-height: 30px;
    }
  </style>
</head>
<body>
  <ul>
    <li></li>
  </ul>
</body>
<script src="https://cdn.bootcss.com/vue/2.6.8/vue.js"></script>
<script>
    console.log(1 === '1')
    var a = 123
    var aa = 123
    console.log(Object.is(a,aa))
    var b = {
        a: 123
    }
    var bb = {
        a: 123
    }
    var c = [1,2,3]
    function d() {

    }
    console.log(typeof a)
    console.log(typeof b)
    console.log(typeof c)
    console.log(typeof d)
    console.log(Object.is(b,bb))
    console.log(Object.prototype.toString.call(1) === "[object Number]")
    console.log(Object.prototype.toString.call([1]) === "[object Array]")
</script>
</html>